We will model turning points for each of the developmental trends at the ages of 3 years (temperament to traits)3, 15 years (childhood to puberty), 30 years (adolescence to adult roles) and 60 years (transition to retirement). Personality research has typically classified measures that focus on infants and toddlers as “temperament” and measures designed for adults as “trait” measures. However, this distinction may not be theoretically meaningful as both assessment strategies attempt to uncover systematic patterns of behavior across situations or time (McCrae et al., 2000). Empirically, temperament has been consistently linked with trait-like measures (Caspi, Harrington, Milne, Amell, Theodore, & Moffitt, 2003; Measelle, John, Ablow, Cowan, & Cowan, 2005; Shiner, Masten, & Tellegen 2002). Other transitions such as early adolescence and associated pubertal changes (Arnett, 2000; McClintock & Herdt, 1996) and retirement and associated aging process (Lucas & Donnellan, 2011; Roberts & DelVecchio, 2000) have been put forward. Each of these periods marks important social and biological transitions that may display different patterns of personality development. Although not often broken down specifically in this way, the FFT would be
